The fastest way to travel among these cities is, of course, flying. There are flights from Hong Kong International Airport to Yiwu Airport (not daily flights - only on Monday, Wednesday, Friday and Sunday. The flights are operated by China Southern Airlines. Flight time is two hours. Airfare would be about ¥1,000 one way. There are daily flights between Hong Kong and Wuhan (Wuhan Tianhe International Airport), operated by Air China, Cathay Pacific, and Dragonair. Flight time, just short of two hours. There do not seem to be direct flights between Hong Kong and Shijiazhuang, but one can fly to Shijiazhuang Zhengding International Airport from either Shenzhen Baoan Airport or Guangzhou Baiyun Airport. You can, of course, first travel to Wuhan or Yiwu and then move on to Shijiazhuang. The three cities form a triangle, with Wuhan in central China, Shijiazhuang farther north, and Yiwu east of the these two cities. There are flights between Wuhan and Shijiazhuang (two hours), but there are no flights between Wuhan and Yiwu, nor between Shijiazhuang and Yiwu.

You can travel by train between Wuhan and Shjiazhuang. Travel time on the faster D trains is about 8 hours. Train fares ¥290-350. There are three train stations in Wuhan (Hankou, Wuchang and Wuhan); don't mix them up. There are two trains stations in Shijiazhuang (Shijiazhuang Station, Shijiazhang North Station). There are train links between Wuhan and Yiwu. One of these trains goes from Wuchang Railway Station to Yiwu in about 7 hours; travel time for other trains between the cities is about 12 hours. Need to get sleeping berths if you end up on one of those trains. There are no direct train links between Shijiazhuang and Yiwu. If you have to travel by train between these two cities, you need to make a connection. For example, go first from Shijiazhuang to Hangzhou and then take a bus to go from Hangzhou to Yiwu. Train travel time in this case would be about 20 hours, so this does not seem to be a good way to travel. Actually, Hangzhou Xiaoshan Airport is about 2 hours away from Yiwu, so one can also fly to Hangzhou Xiaoshan Airport and then take a shuttle bus to go to Yiwu.